[Stoves] [biochar] Gasifier stove grant (and semi-gasifiers)

Thu Nov 1 10:28:30 CDT 2012

I would add that a batch loaded TLUD type stove has the advantage over a
side fed stove because flame fills a constricted space above the fuel.
Forcing gases and smoke to enter flame makes for a cleaner burn.

Best,

Dean

On Wed, Oct 31, 2012 at 7:50 PM, Kevin <kchisholm at ca.inter.net> wrote:

> **
>
>
>
> Dear Paul
>
>
>
> ----- Original Message -----
> *From:* Paul Anderson <psanders at ilstu.edu>
> *To:* Discussion of biomass cooking stoves<stoves at lists.bioenergylists.org>;
> biochar at yahoogroups.com
> *Sent:* Tuesday, October 30, 2012 4:05 PM
> *Subject:* [biochar] Gasifier stove grant (and semi-gasifiers)
>
>
>
> Stovers, and Gasifier folks,
>
> Let's give a big round of applause to Colorado State University and also
> to Envirofit for their strong entry into the world of gasifier cookstoves!!!
>
> One million dollars worth of encouragement for a strong entry is
> fantastic.   Congratulations.   Details are at:
>
> http://www.news.colostate.edu/Release/6485
>
>
> # Interesting article!
>
> The press release states:
>
> “It [semi-gasifier] separates the combustion process into two phases. In
> the first phase, combustible gasses are released from solid biomass. In the
> second phase, those combustible gasses are mixed with air and create a
> secondary flame,” Tryner said.
>
> I think that definition is a good one for "gasifiers" and is certainly how
> the term has been used for a decade and more regarding cooking stoves.
>
> # I would suggest that a good definition of a "Gasifier" is as follows:
> Gasifier: A Gasifier is a device for converting a solid or liquid fuel
> into a fuel gas.
>
> # There are three main types of "Gasifiers":
> 1: Retort:  A fuel placed in a sealed vessle, with no access to oxygen,
> and heated with an external source of heat can yield  "pyrolysis gases"
> that can be captured and led away for chemical recovery, purification, for
> use as a fuel gas elsewhere, etc.
> 2: Air Blown Gasifier: Air/oxygen is contacted with a solid fuel at a
> temperature above its ignition point, to initiate pyrolysis and combustion,
> in the "Reaction Zone", and  CO2 and H2O in partially combusted gases are
> reduced back to CO and H2 by incandescent char in the "Reaction Zone",
> leaving little to no residual charcoal. An "Air Blown Gasifier" can be
> characterized by the intentional supply of only "Primary Air", for
> gasification of the fuel, and with none of the air supplied leaving the
> gasifier as "products of intended combustion. "
> 3: Semi-Gasifier: A "Semi-Gasifier" is identical to an "Air Blown
> Gasifier", EXCEPT that by design,  or by operation, it leaves a significant
> portion of its initial carbon content as an ungasifier char residue.
>
> #  A"Gasifier" differs fundamentally from a "Combustor", where a fuel is
> burned to completion. A "Combustor" can be easily distinguished from a
> "Gasifier" by the presence of "purposefully added provision for the
> introduction of secondary air, to a fuel gas intended for combustion to
> completion."
>
> So I will ask the first question:
>
> Please define the difference between a "semi-gasifier" and a "gasifier" in
> the terminology used by CSU.   (I hope you just drop the "semi-" part.)
>
> # The difference between a "Gasifier" and a "Semi-Gasifier" is that a
> "Gasifier" converts substantially all the fuel provided into a gas, while a
> "Semi-Gasifier" converts only part of the supplied fuel to a gas, and
> leaves behind a significant portion of the carbon energy content of the
> initial fuel as char which was not gasified..
>
>
> # Following is a copy of a picture from the website:
>
> http://www.news.colostate.edu/content/photos/Semi%20gasifier%20schematic.jpg
>
>
> # This is puzzling... they term their device a "Semi-Gasifier Stove", yet
> 1: It is NOT a semi-gasifier, in that neither in the schematic, nor in
> their website text, do they acknowledge the production of char.
> 2: There is clear provision of "secondary air" for the intended combustion
> of the products of gasification, ie, it is a "combustor". (or stove.)
> It should more properly be termed a "Gasifier Stove" in that all the fuel
> is gasified, with no residual char.
>
> # On the other hand, a TLUD is clearly a "Semi-Gasifier Combustor"
> (Stove), in that
> 1: A significant portion of the supplied fuel leaves the system as char
> 2: There is definite provision for the introduction of secondary air, to
> burn the products of gasification to completion.
>
> The folks at CSU do GREAT work, and I am sure that their entry into this
> aspect of improved cookstoves will result is some great benefits.
>
> # I must be missing something here, but aren't they simply re-inventing
> the pellet stove?"
> Best wishes,
>
> Kevin
>
> Paul
>
> Paul S. Anderson, PhD  aka "Dr TLUD"
> Email:  psanders at ilstu.edu   Skype: paultlud  Phone: +1-309-452-7072
> Website:  www.drtlud.com
>
>
>
> -------- Original Message --------
>   Subject: Re: you and Hugh and biochar Date: Tue, 30 Oct 2012 08:23:21
> -0600 From: John Field <john.l.field at gmail.com> <john.l.field at gmail.com> To:
> Paul Anderson <psanders at ilstu.edu> <psanders at ilstu.edu> CC: Hugh
> McLaughlin <wastemin1 at verizon.net> <wastemin1 at verizon.net>
>
>
>
>
> However, the general consensus is that only forced-draft gasifier
> cookstoves deliver remarkably low emissions, whereas natural draft
> gasifiers tend to be similar or only marginal better than most rocket stove
> designs.  This is an impression reinforced by my own (very limited) work,
> as well as by the attached recent paper by Abishek Kar of the Surya
> project.  In contrast, the recent paper by Jim Jetter's group is more
> difficult to interpret, and includes a natural draft gasifier with better
> high-performance emissions than all other stoves tested, as well as a
> forced-draft gasifier among the worst performers.  Go figure!
>
>
>
>
>
> On Mon, Oct 29, 2012 at 5:35 PM, John Field <john.l.field at gmail.com>wrote:
>
>> Apologies for the lack of communication here- I was away all last week at
>> the ASA-SSSA-CSSA conference.  No new stoves/biochar news at the moment;
>> I'm totally preoccupied preparing for my prelim exam for the next several
>> weeks.
>>
>> Hope you well,
>> john
>>
>>
>>
>>
>>
>> On Mon, Oct 29, 2012 at 5:05 PM, Paul Anderson <psanders at ilstu.edu>wrote:
>>
>>> John,
>>>
>>> Sorry that you and Hugh did not meet when he was in Boulder last week.
>>>
>>> Are there any more developments involving you and stoves and biochar?
>>>
>>> Doc
>>>
>>> --
>>> Paul S. Anderson, PhD  aka "Dr TLUD"
>>> Email:  psanders at ilstu.edu   Skype: paultlud  Phone: +1-309-452-7072
>>> Website:  www.drtlud.com
>>>
>>>
>>
>>
>> --
>> Thank you,
>> John Field
>> NSF IGERT Fellow, Multidisciplinary Approaches to Sustainable BioEnergy
>> Department of Mechanical Engineering, Colorado State University
>>
>> email:  john.L.field at colostate.edu
>> cell:  (317) 748-9792
>> bioenergy-igert.colostate.edu
>> bioenergyigert.wordpress.com
>>
>>
>
>
> --
> Thank you,
> John Field
> NSF IGERT Fellow, Multidisciplinary Approaches to Sustainable BioEnergy
> Department of Mechanical Engineering, Colorado State University
>
> email:  john.L.field at colostate.edu
> cell:  (317) 748-9792
> bioenergy-igert.colostate.edu
> bioenergyigert.wordpress.com
>
>
>
>
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